设计 React Native 按钮的样式

了解如何在 React Native 应用中设置按钮样式。

React Native 导出一个 <Button> 组件，该组件公开 Android、iOS 和 Web 的原生按钮元素。此组件接受 title 和 onPress 属性。它不接受 style 属性并且不支持自定义样式。

¥React Native exports a <Button> component that exposes the native button element for Android, iOS, and the web. This component accepts title and onPress props. It does not accept a style prop and doesn't support custom styling.

最接近从 React Native 导出的 <Button> 样式的是使用 color 属性。以下是 Android、iOS 和 Web 上的两个按钮的示例。

¥The closest you can get to styling a <Button> exported from React Native is with the color prop. Below is an example of two buttons on Android, iOS, and the web.

第一个按钮是默认的 <Button>，第二个按钮是另一个默认的 <Button>，其 color 属性设置为 "red"。

¥The first button is the default <Button> and the second is another default <Button> with its color prop set to "red".

要创建具有自定义样式的按钮，你可以使用 <Pressable> 组件。<Pressable> 除了允许我们自定义其行为之外，还允许我们完全自定义可按下元素（如按钮）的外观。

¥To create a button with a custom style, you can turn to the <Pressable> component. <Pressable> lets us fully customize the appearance of a pressable element (like a button), in addition to allowing us to customize its behavior.

下面是使用 <Pressable> 创建按钮组件的示例：

¥Here's an example of using <Pressable> to create a button component:

import React from 'react';
import { Text, StyleSheet, Pressable } from 'react-native';

export default function Button(props) {
  const { onPress, title = 'Save' } = props;
  return (
    <Pressable style={styles.button} onPress={onPress}>
      <Text style={styles.text}>{title}</Text>
    </Pressable>
  );
}

const styles = StyleSheet.create({
  button: {
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: 12,
    paddingHorizontal: 32,
    borderRadius: 4,
    elevation: 3,
    backgroundColor: 'black',
  },
  text: {
    fontSize: 16,
    lineHeight: 21,
    fontWeight: 'bold',
    letterSpacing: 0.25,
    color: 'white',
  },
});

这是这段代码的结果：

¥And here's the result of this code:

React Native 的 <Button> 组件不接受 style 属性，其 color 属性受到限制，并且在 Android、iOS 和 Web 上的显示方式有所不同。使用 <Pressable> 组件，我们可以创建适合我们应用设计的自定义按钮。这些样式在 Android、iOS 和 Web 上也将是相同的，这将使我们的应用在每个平台上具有一致的外观。

¥React Native's <Button> component does not accept a style prop, and its color prop is limited and appears differently across Android, iOS, and the web. With the <Pressable> component, we can create custom buttons that fit our app's design. Those styles will also be the same across Android, iOS, and the web, which will give our apps a consistent look on every platform.